Effects of sodium sulfate concentration on the sulfate resistance of mortars with and without silica fume

Aköz, Fevziye; Türker, Fikret; Koral, Sema; Yüzer, Nabi

doi:10.1016/0008-8846(95)00128-y

Cited by 65 publications

(17 citation statements)

References 5 publications

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“…Akoz et al (1995) reported the effect of different concentrations (2700, 18 000, and 72 000 mg/L) of sodium sulphate solutions on strength and mass changes of mortars with or Can. J. Civ.…”

Section: Discussionmentioning

confidence: 99%

Sulphate resistance of silica fume blended mortars exposed to various sulphate solutions

Moon¹,

Lee²,

Kim³

2003

Can. J. Civ. Eng.

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The different performances of silica fume blended mortars placed in various sulphate-bearing exposure conditions were investigated. Experimental study was carried out on mortars immersed in 5% sodium sulphate, 5% magnesium sulphate, and mixed 5% sodium sulphate and 5% magnesium sulphate solutions for 270 d of sulphate exposure. Another variable was the replacement ratio of cement with silica fume (0, 5, 10, and 15% of the cement by weight). The results showed conclusively that silica fume should be given serious consideration for use in sulphate environments. In other words, in a sodium sulphate solution, silica fume showed a beneficial effect on mitigating compressive strength reduction and length change of mortars. However, the strength deterioration factor of the mortar specimen with some silica fume content (especially 15% of the cement by weight) was greater than that of the mortar specimen without silica fume under Mg 2+ ion oriented attack. These different sulphate deterioration mechanisms are presented in the study. Microstructural investigations such as X-ray diffraction (XRD), scanning electron microscopy (SEM), energydispersive X-ray analysis (EDXA), and mercury intrusion porosimetry (MIP) were also used to support the explanation for these mechanisms.Résumé : Cet article présente les résultats d'études sur les différents rendements des mortiers mélangés à des fumées de silice placé dans diverses conditions d'expositions à des sulfates. Les expériences ont été effectuées sur des mortiers respectivement immergés dans une solution de sulfate de sodium à 5 %, une solution de sulfate de magnésium à 5 % et une solution mixe de sulfate de sodium à 5 % et de sulfate de magnésium à 5 % pour 270 jours d'exposition aux sulfates. Une autre variable a été le ratio de remplacement du ciment par des fumées de silice (0, 5, 10 et 15 % de ciment en poids). Les résultats démontrent irréfutablement que l'utilisation de fumées de silice doit être sérieusement considérée pour les environnements de sulfate correspondants. En d'autres mots, dans les solutions de sulfate de sodium, les fumées de silice ont un effet bénéfique sur l'atténuation de la réduction de la résistance à la compression et du changement de longueur des mortiers. Cependant, le facteur de détérioration de la résistance de l'échantillon de mortier contenant une certaine quantité de fumées de silice (particulièrement 15 % de poids de ciment) était supérieur à celui des échantillons de mortiers ne contenant pas de fumées de silice et qui étaient attaqués par l'ion Mg 2+ . Ces différents mécanismes de détérioration par les sulfates sont présentés dans l'étude. Afin de soutenir l'explication des mécanismes, la microstructure a aussi été étudiée par des méthodes telles que la diffraction des rayons X (« X-ray diffraction: XRD »), le microscope électronique à balayage (« scanning election microscopy: SEM »), l'analyse aux rayons X par dispersion d'énergie (« energy dispersive X-ray analysis : EDXA») et la porosimétrie au mercure (« mercury intrusion porosimetry ...

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“…Akoz et al (1995) reported the effect of different concentrations (2700, 18 000, and 72 000 mg/L) of sodium sulphate solutions on strength and mass changes of mortars with or Can. J. Civ.…”

Section: Discussionmentioning

confidence: 99%

Sulphate resistance of silica fume blended mortars exposed to various sulphate solutions

Moon¹,

Lee²,

Kim³

2003

Can. J. Civ. Eng.

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show abstract

“…Many authors have reported that the cement is partially replaced by silica fume increases the resistance of concrete to sulfate attack. This beneficial effect is attributed to the reduction in Ca(OH) 2 and alumina required for gypsum and ettringite and to the improvement of pore structure [5,6]. Some authors studied the effect of fly ash on the resistance of concrete/mortar to sulfate attack and pointed out that using sufficient amount of fly ash, especially low-calcium or F class fly ash can effectively increase the resistance of the concrete against sulfate attack [3,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of sea water and MgSO4 solution on the mechanical properties and durability of self-compacting mortars with fly ash/silica fume

Benli

Karataş

Gürses

2017

Construction and Building Materials

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“…The use of silica fume in concrete increases the resistance of concrete to acid and sulfate attack; it improves durability of concrete by reducing porosity and permeability of cement paste matrix [1,[9][10][11]. It makes the concrete more resistant to abrasive forces, and reduces the expansion generated by alkali-aggregate expansion [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of dry and wet curing conditions on compressive strength of silica fume concrete

Atiş

Özcan

Kılıç

et al. 2005

Building and Environment

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Effects of sodium sulfate concentration on the sulfate resistance of mortars with and without silica fume

Cited by 65 publications

References 5 publications

Sulphate resistance of silica fume blended mortars exposed to various sulphate solutions

Sulphate resistance of silica fume blended mortars exposed to various sulphate solutions

Effect of sea water and MgSO4 solution on the mechanical properties and durability of self-compacting mortars with fly ash/silica fume

Influence of dry and wet curing conditions on compressive strength of silica fume concrete

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